Medical device with adhesive patch longevity

An infusion unit, comprising:

• a hub to define a fluid flow path to receive a fluid;
• an adhesive patch coupled to the hub, the adhesive patch to couple the hub to an anatomy, the adhesive patch defining an edge that extends along a perimeter of the adhesive patch;
• and
• an anisotropic shim coupled to the adhesive patch along the perimeter of the adhesive patch proximate the edge to resist an uncoupling of the adhesive patch from the anatomy, the anisotropic shim defining a central bore and coupled to the adhesive patch such that the central bore is positioned about the hub, the anisotropic shim extends along a longitudinal axis and has an inner periphery spaced apart from an outer periphery, the anisotropic shim is locally rigid between the inner periphery and the outer periphery and flexible along the longitudinal axis, the anisotropic shim includes at least one first slit defined at the outer periphery, the at least one first slit extends radially inward toward the inner periphery and terminates at a first bore defined through the anisotropic shim, at least one second slit defined at the inner periphery, the at least one second slit extends radially outward toward the outer periphery and terminates at a second bore defined through the anisotropic shim, and the first bore has a first radial distance defined between the first bore and the inner periphery that is different than a second radial distance defined between the second bore and the inner periphery.

An infusion unit, comprising:

• a hub to define a fluid flow path to receive a fluid;
• an adhesive patch coupled to the hub, the adhesive patch to couple the hub to an anatomy, the adhesive patch defining an edge that extends along a perimeter of the adhesive patch;
• and
• an anisotropic shim coupled to the adhesive patch along the perimeter of the adhesive patch proximate the edge to resist an uncoupling of the adhesive patch from the anatomy, the anisotropic shim spaced a distance apart from the edge of the adhesive patch, the anisotropic shim defining a central bore and coupled to the adhesive patch such that the central bore is positioned about the hub, the anisotropic shim extends along a longitudinal axis and has an inner periphery spaced apart from an outer periphery, the inner periphery spaced apart from the hub by a distance, the anisotropic shim is locally rigid between the inner periphery and the outer periphery and flexible along the longitudinal axis, the anisotropic shim includes at least one first slit defined at the outer periphery, the at least one first slit extends radially inward toward the inner periphery and terminates at a first bore defined through the anisotropic shim, at least one second slit defined at the inner periphery, the at least one second slit extends radially outward toward the outer periphery and terminates at a second bore defined through the anisotropic shim, the first bore has a first radial distance defined between the first bore and the inner periphery that is different than a second radial distance defined between the second bore and the inner periphery, and the first bore and the second bore are defined through the anisotropic shim between the inner periphery and the outer periphery.